CN1293881A - Speaker device - Google Patents

Speaker device Download PDF

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Publication number
CN1293881A
CN1293881A CN99804155A CN99804155A CN1293881A CN 1293881 A CN1293881 A CN 1293881A CN 99804155 A CN99804155 A CN 99804155A CN 99804155 A CN99804155 A CN 99804155A CN 1293881 A CN1293881 A CN 1293881A
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CN
China
Prior art keywords
mentioned
primary coil
cylindrical body
yoke
speaker unit
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Granted
Application number
CN99804155A
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Chinese (zh)
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CN1189060C (en
Inventor
大桥芳雄
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Sony Corp
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Sony Corp
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Publication of CN1189060C publication Critical patent/CN1189060C/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/045—Mounting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
    • H04R2209/043—Short circuited voice coils driven by induction

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)

Abstract

A speaker device comprises a magnetic circuit, a diaphragm, a secondary coil, at least one primary coil, a cylinder, and a positioning part. The magnetic circuit includes a magnet, a yoke for holding the magnet, and a top plate cooperative with the yoke to form a magnetic gap. The primary coil is set in a magnetic gap of the magnetic circuit. The secondary coil is fitted to the diaphragm in such a manner that it is opposed to the primary coil in the magnetic gap. The cylinder is connected to the primary coil on its end within the gap to energize the primary coil. The positioning part is provided on the yoke and positions the other end of the cylinder.

Description

Speaker unit
Technical field
The present invention relates to speaker unit.Particularly, the present invention relates to have the speaker unit of primary coil and secondary coil.
Background technology
So far, the electromagnetic induction loud speaker is known, for this loud speaker, has magnet to be configured in the so-called internal magnetic type electromagnetic induction loud speaker of inboard and the so-called external magnetic type electromagnetic induction loud speaker that magnet is configured in the outside.
As shown in fig. 1, internal magnetic type electromagnetic induction loud speaker 100 possesses: yoke 110, magnet 120 and vibrating reed 130.
The circular annular plate 113 that stretches out the surrounding wall portion 112 of setting upward and be arranged on these surrounding wall portion 112 upper limbs discoid bottom surface sections 111, from the periphery of this bottom surface sections 111 forms as one and constitutes yoke 110.Columned magnet 120 is installed on the central part of bottom surface sections 111 upper surfaces.The upper surface of the annular plate 113 of yoke 110 is installed on the framework 140.
Discoid central plate 150 is installed on the upper surface of magnet 120, this central plate 150 is configured in the centre bore 113a of annular plate 113.The gap that forms between annular plate 113 and the central plate 150 is a magnetic gap 160.
In vibrating reed 130, form be arranged on be roughly on the central portion hemispheric circular top part 131, and with the periphery of circular top part 131 continuously and the section shape of setting forms little circular-arc edge part 132.The outer end of edge part 132 is installed on the upper surface of framework 140.By bonding etc., the upper end of cylindric bobbin 170 is fixed on the outer peripheral edges of circular top part 131.
The secondary coil 171 of 1 circle is twined, is fixed on leaning on the end portion of bobbin 170, and this secondary coil 171 is located in the magnetic gap 160 that forms between annular plate 113 and the central plate 150.
Outer circumferential side primary coil 180 and interior all side primary coils 190 are configured in the magnetic gap 160 with clamping secondary coil 171 and mode opposite one another.Outer circumferential side primary coil 180 is fixed on the inner peripheral surface of yoke 110 annular plates 113, and interior all side primary coils 190 are fixed on the outer peripheral face of central plate 150, and outer circumferential side primary coil 180 is connected in series with interior all side primary coils 190.One end of outer circumferential side primary coil 180 and interior all side primary coils 190 is connected with signal lead-out wire 180a, 190a respectively.
So, in case handle is based in all side primary coils 190 in never the electric current supply of the audio signal of illustrated acoustic signal reproducing unit supply reaches to outer circumferential side primary coil 180, induced current just flows in the secondary coil in being configured in magnetic gap 160 171, make vibrating reed 130 vibration by Lorenz (Lorentz) power, output based on the audible sound that supplies to the electric current corresponding audio signal in the primary coil 190.
As shown in Figure 2, external magnetic type loud speaker 200 possesses: yoke 210, magnet 220 and vibrating reed 230.
In yoke 210, form discoid bottom surface sections 211 and reach the newel 212 that stretches out upward from the central part of bottom surface sections 211, magnet 220 cylindraceous is installed on the outer end of bottom surface sections 211 upper surfaces.
Circular annular plate 240 is installed on the upper surface of magnet 220 the corresponding annular plate 240 that is provided with the upper end of newel 212.The outer end upper surface of annular plate 240 is installed on the framework 250.The gap that forms between annular plate 240 and newel 212 is a magnetic gap 260.
Vibrating reed 230 is made of following: be positioned on the central portion, section shape is circular-arc central portion 231; Be provided with continuously and the rake 232 of upward displacement with the periphery of this central portion 231 along with outside stretching, extension; With the continuous edge part 233 of the periphery of this rake 232; And the fixed part 234 that is provided with continuously with the periphery of central portion 231, stretches out to the direction opposite with rake 232.The outer end of edge part 233 is installed on the outer end upper surface of framework 250.By bonding etc., the upper end of cylindric bobbin 270 is fixed on the leading section of fixed part 234.
The secondary coil 271 of 1 circle is twined, is fixed on leaning on the end portion of bobbin 270, and secondary coil 271 is located in the magnetic gap 260 that forms between annular plate 240 and the newel 212.
Outer circumferential side primary coil 280 and interior all side primary coils 290 are configured in the magnetic gap 260 with clamping secondary coil 271 and mode opposite one another.Outer circumferential side primary coil 280 is fixed on the inner peripheral surface of annular plate 240, and interior all side primary coils 290 are fixed on the outer peripheral face upper end of newel 212, and outer circumferential side primary coil 280 is connected in series with interior all side primary coils 290.One end of outer circumferential side primary coil 280 and interior all side primary coils 290 is connected with signal lead-out wire 280a, 290a respectively.
So, same with the loud speaker 100 shown in above-mentioned Fig. 1, in case handle is based in all side primary coils 290 in never the electric current supply of the audio signal of illustrated acoustic signal reproducing unit supply reaches to outer circumferential side primary coil 280, induced current just flows in the secondary coil in being configured in magnetic gap 260 271, make vibrating reed 230 vibration by Lorentz force, output based on the audible sound of the electric current corresponding audio signal of supplying with.
But, when being fixed on annular plate 113,240 or central plate 150 or the newel 212, in general following 2 kinds of methods are arranged to above-mentioned primary coil 180,190,280,290.
(1) under the state on the outer peripheral face that primary coil 180,190,280,290 is twined, is fixed to not shown tubular bobbin, it is embedded into annular plate 113,240 or be embedded into central plate 150 outward or newel 212 on, fix by bonding.
(2) under the state that has twined primary coil 180,190,280,290 without bobbin (forming) as no bobbin coil, it is embedded into annular plate 113,240 or be embedded into central plate 150 outward or newel 212 on, fix by bonding.
In general, because be embedded into annular plate 113,240 or be embedded into central plate 150 outward or newel 212 on above-mentioned bobbin and primary coil 180,190,280,290 extremely thin, bad mechanical strength, so be embedded into annular plate 113,240 or outside when being embedded on central plate or the newel 212, bobbin and primary coil 180,190,280,290 are not contacted with annular plate 113,240, central plate 150, newel 212, do not produce damage.
Thereby, in above-mentioned any method all be, under the state that has twined primary coil 180,280 in advance, make its external diameter slightly littler than the internal diameter of annular plate 113,240, between primary coil 180,280 and annular plate 113,240 the filling bonding agent, fix, perhaps under the state that has twined primary coil 190,290 in advance, make its internal diameter bigger slightly than the external diameter of central plate 150 or newel 212, filling bonding agent between primary coil 190,290 and central plate 150 or newel 212 is fixed.
But, exist following such problem, because the thickness of annular plate 113,240, central plate 150 and newel 212 is all thinner, so the area of each side face is little, the adhesive strength of primary coil 180,190,280,190 and annular plate 113,240, central plate 150, newel 212 is poor.
Usually, in the internal magnetic type electromagnetic induction loud speaker 100 shown in Figure 1, after being fixed to interior all side primary coils 190 on the central plate 150, this central plate 150 is fixed on the magnet 120 that is installed under the state that has carried out the location on the yoke 110.On the other hand, in the external magnetic type electromagnetic induction loud speaker 200, after being fixed to outer circumferential side primary coil 280 on the annular plate 240, this annular plate 240 is fixed on the magnet 220 that is installed under the state that has carried out the location on the yoke 210 shown in figure 2.
When carrying out that this annular plate 240 is fixed to operation on the magnet 220, for the predetermined gap that keeps magnetic gap 160,260 is being inserted clearance gauge between outer circumferential side primary coil 180 and the interior all side primary coils 190 or between outer circumferential side primary coil 280 and interior all side primary coils 290 at interval in advance, adjust so that clearance gap becomes constantly in a circumferential direction, carry out the location of each parts.When carrying out this positioning operation, then adhesive strength is poor because if clearance gauge contacts with primary coil 180,190,280,290, so primary coil 180,190,280,290 has the danger that comes off from annular plate 113,240, central plate 150, newel 212.
Disclosure of an invention
The problem of speaker unit of the present invention is, overcomes the problems referred to above, can easily carry out the location of primary coil, seeks to improve the installation strength of primary coil simultaneously.
The described speaker unit in the present invention the 1st aspect is characterised in that to possess:
Magnetic circuit portion has: magnet, be provided with magnet yoke, formed the top board of magnetic gap with yoke;
At least one primary coil is configured in the magnetic gap of magnetic circuit portion;
Vibrating reed;
Secondary coil is to be arranged in the magnetic gap with the opposed mode of primary coil concerning vibrating reed;
Cylindrical body, a side that is positioned at magnetic gap is installed on the primary coil, and primary coil is powered; And
The location division is arranged on yoke person, positions for the opposite side of cylindrical body.
In the described speaker unit, for the predetermined gap that obtains magnetic gap does not need to use clearance gauge at interval, the erection space of primary coil becomes big simultaneously aspect the 1st.
The simple declaration of accompanying drawing
Fig. 1 is the summary vertical profile profile that existing internal magnetic type electromagnetic induction loud speaker is shown;
Fig. 2 is the summary vertical profile profile that existing external magnetic type electromagnetic induction loud speaker is shown;
Fig. 3 illustrates the summary vertical profile profile that device indicating of the present invention is applied to the 1st example of internal magnetic type electromagnetic induction loud speaker;
Fig. 4 is the summary vertical profile profile that the internal magnetic type electromagnetic induction loud speaker that has only disposed primary coil on a side of secondary coil is shown;
Fig. 5 illustrates the summary vertical profile profile that the 1st cylindrical body directly is fixed to the internal magnetic type electromagnetic induction loud speaker on the annular plate;
Fig. 6 illustrates the summary vertical profile profile of location division as the internal magnetic type electromagnetic induction loud speaker of groove formation;
Fig. 7 illustrates the summary vertical profile profile that speaker unit of the present invention is applied to the 2nd example of external magnetic type electromagnetic induction loud speaker.
Fig. 8 is for to illustrate the figure that speaker unit of the present invention is applied to the conductivity ring is fixed to the 3rd example of the conductivity type speaker unit that forms on the vibrating reed with Fig. 9, and this figure is the summary vertical profile profile of speaker unit.Fig. 9 is the expansion vertical profile profile of major part;
Figure 10 illustrates the expansion vertical profile profile that bobbin is fixed to the major part of the speaker unit on the vibrating reed;
Figure 11 illustrates the expansion vertical profile profile that the bobbin that has formed bend is fixed to the major part of the speaker unit on the vibrating reed.
The optimal morphology that is used to carry out an invention
Following with reference to accompanying drawing, each example of speaker unit of the present invention is described.
Have, the example that below illustrates is for being applied to the present invention the form in the electromagnetic induction loud speaker again.
At first, as the 1st example, the internal magnetic type electromagnetic induction loud speaker 1 shown in the key diagram 3.
Internal magnetic type electromagnetic induction loud speaker 1 possesses: yoke 2, magnet 3 and vibrating reed 4.
In yoke 2, form roughly discoid bottom surface sections 5, stretch out the surrounding wall portion 6 of placement upward and be arranged on the circular annular plate 7 of these surrounding wall portion 6 upper limbs from the periphery of bottom surface sections 5.On the central part upper surface of bottom surface sections 5, formed location division 8.
From the vertical section shape, with the step-like location division 8 that forms, form the 1st stage portion 9 and the 2nd stage portion 10 with bottom surface sections 5 from the bottom surface sections 5 of yoke 2.With discoid formation the 1st stage portion 9, its peripheral part 9a is as the 1st step difference face, and upper surface 9b is positioned at the place, top slightly of the upper surface of bottom surface sections 5.With discoid the 2nd stage portion 10 that forms, with the 9 coaxial settings of the 1st stage portion than the 1st stage portion 9 little circles.Form the outer peripheral face 10a of the 2nd stage portion 10 as the 2nd step difference face, upper surface 10b is positioned at the place, top slightly of the upper surface 9b of the 1st stage portion 9.
Columned magnet 3 is installed on the central portion of the 2nd stage portion 10 upper surface 10b.By magnet 3 is configured in the not shown location indentations that for example forms on the upper surface 10b of the 2nd stage portion 10, and with itself and the 2nd stage portion 10 arranged coaxial.
The upper surface of the annular plate 7 of yoke 2 is installed on the framework 11.Central shaft with location division 8 is a benchmark, and the inner peripheral surface of annular plate 7 is positioned at the outside slightly of the 1st step difference face 9a of the 1st stage portion 9.
Central plate 12 as the figure plate-like of top board is installed on the upper surface of magnet 3, this central plate 12 is configured in the centre bore 7a of annular plate 7.Central shaft with location division 8 is a benchmark, and the side face of central plate 12 is positioned at the 2nd step difference face 10a same-phase place with the 2nd stage portion 10.The gap that forms between annular plate 7 and central plate 12 becomes and is magnetic gap 13.Constitute magnetic circuit by yoke 2, magnet 3, annular plate 7 and central plate 12.
Whole vibrating reed 4 forms with the general dome shape, forms in the vibrating reed 4: be positioned at the hemispheric circular top part 4a of being roughly of central portion, and with the periphery of circular top part 4a continuously and the section shape that is provided with little, circular-arc edge part 4b roughly.The outer end of edge part 4b is installed on the upper surface of framework 11.By bonding etc., the upper end of cylindric bobbin 14 is fixed on the outer peripheral edges of circular top part 4a inner surface.Also can make structure described later about vibrating reed 4 and the bonding of bobbin 14.
The secondary coil 15 of 1 circle is twined, is fixed on leaning on the end portion of bobbin 14, and this secondary coil 15 is located in the magnetic gap 13 that forms between annular plate 7 and the central plate 12.
Outer circumferential side primary coil 16 and interior all side primary coils 17 are configured in the magnetic gap 13 with clamping secondary coil 15 and mode opposite one another.Outer circumferential side primary coil 16 is connected in series with interior all side primary coils 17, and an end separately is connected with lead-out wire 16a, the 17a of supply from the audio signal of not shown acoustic signal reproducing unit.
Outer circumferential side primary coil 16 twines, is fixed on the upper end periphery of the 1st cylindrical body 18 that forms the thin cylinder shape.It is identical with the external diameter of the 1st stage portion 9 that the 1st cylindrical body 18 is formed its internal diameter.The bottom inner surface of the 1st cylindrical body 18 is bonded on the 1st step difference face 9a of the 1st stage portion 9 of location division 8.The outer peripheral face that is fixed on the outer circumferential side primary coil 16 on the 1st cylindrical body 18 is bonded on the inner peripheral surface of annular plate 7.
Be fixed on being undertaken by following of outer circumferential side primary coil 16 on the 1st cylindrical body 18 to the fixing of yoke 2, for example, the 1st cylindrical body 18 is inserted in the yoke 2 from the top, the bottom of the 1st cylindrical body 18 is bonded on the 1st step difference face 90, simultaneously, the outer peripheral face of outer circumferential side primary coil 16 is bonded on the inner peripheral surface of annular plate 7.
The outer circumferential side primary coil 16 that is fixed on the 1st cylindrical body 18 carries out like this to the fixing of yoke 2, for example the bottom with the 1st cylindrical body 18 bonds on the 1st step difference face 9a, and the outer peripheral face with outer circumferential side primary coil 16 bonds on the inner peripheral surface of annular plate 7 simultaneously.
Interior all side primary coils 17 twine, are fixed on the upper end periphery of the 2nd cylindrical body 19 that forms the thin cylinder shape.It is identical with the external diameter of the 2nd stage portion 10 that the 2nd cylindrical body 19 is formed its internal diameter.The bottom inner surface of the 2nd cylindrical body 19 is bonded on the 2nd step difference face 10a of the 2nd stage portion 10 of location division 8.The inner peripheral surface of the 2nd cylindrical body 19 upper ends is bonded on the outer peripheral face of central plate 12.
Be fixed on being undertaken by following of interior all side primary coils 17 on the 2nd cylindrical body 19 to the fixing of yoke 2, for example, in advance the 2nd cylindrical body 19 outer being embedded on the central plate 12, the inner surface of the 2nd cylindrical body 19 upper ends is bonded on the central plate 12, under the state that the 2nd cylindrical body 19 is fixed on the central plate 12, the 2nd cylindrical body 19 is inserted in the yoke 2 from the top of yoke 2 with central plate 12, the bottom of the 2nd cylindrical body 19 is bonded on the 2nd step difference face 10a.The 2nd cylindrical body 19 outer being embedded on the 2nd stage portion 10 of location division 8, the location of 17 pairs of yokes 2 of all side primary coils is also carried out the location that 12 pairs of central plates are installed in the magnet 3 on the yoke 2 thus simultaneously in carrying out thus.Suitable methods such as central plate 12 is bonding to the fixedly use of magnet 3, screw clamp are carried out.
So, as mentioned above, in the internal magnetic type electromagnetic induction loud speaker 1 shown in Figure 3, on yoke 2, form location division 8, only, just can carry out the location of outer circumferential side primary coil 16 and interior 17 pairs of yokes 2 of all side primary coils by outer respectively being embedded on the 1st stage portion 9 and the 2nd stage portion 10 of location division 8 of the 2nd cylindrical body 19 of having fixed outer circumferential side primary coil 16 and the 1st cylindrical body 18 and having fixed interior all side primary coils 17.
Thereby, can extremely easily carry out the location of outer circumferential side primary coil 16 and interior 17 pairs of yokes 2 of all side primary coils, owing to do not need to use clearance gauge, so do not worry above-mentioned the causing from yoke 2 etc. and come off of problem so far that become because of clearance gauge contacts with outer circumferential side primary coil 16 or interior all side primary coils 17.
Since the 1st step difference face 9a that the 1st cylindrical body 18 is bonded to location division 8 go up simultaneously be fixed to that outer circumferential side primary coil 16 on the 1st cylindrical body 18 bonds on the annular plate 7 and, the 2nd cylindrical body 19 is bonded on the 2nd step difference face 10a of location division 8 and bond to simultaneously on the central plate 12, so bonding position increases, bond area becomes big thus, has improved the adhesive strength of outer circumferential side primary coil 16 and interior all side primary coils 17.
About above-mentioned location division 8, as long as on the bottom surface sections 5 of yoke 2, form 2 stage portion 9,10, so the formation of location division 8 is easy.
In above-mentioned location division 8, so that the mode of the centre of yoke 2 in the top formed stage portion 9,10, still, can be on the contrary, the bottom surface forms in the mode of below with the centre of yoke 2 and moves such recess stage by stage downwards, and the location division is set.
In the internal magnetic type electromagnetic induction loud speaker 1 shown in Figure 3, disposed primary coil with clamping secondary coil and mode opposite one another, but the present invention also can be applied to the primary coil shown in Fig. 4 and only be configured among the internal magnetic type electromagnetic induction loud speaker 1A on secondary coil one side.
Moreover, compare with the internal magnetic type electromagnetic induction loud speaker 1 shown in Fig. 3, internal magnetic type electromagnetic induction loud speaker 1A and the primary coil that below illustrates only is configured on the side of secondary coil and corresponding as the location division these two aspects of a stage portion only to be set different, in the explanation of internal magnetic type electromagnetic induction loud speaker 1A, only explain with internal magnetic type electromagnetic induction loud speaker 1 and compare and different parts, for other parts attached with part same in internal magnetic type electromagnetic induction loud speaker 1 on the identical symbol of appended symbol, omit its explanation.
About location division 8A, formed discoid stage portion 10A, its outer peripheral face 10C becomes and is the step difference face.
Primary coil 17A joined show in magnetic gap 13, and between secondary coil 15 and central plate 12.Primary coil 17A is connected with the signal lead-out wire 17a of supply from the audio signal of not shown acoustic signal reproducing unit.
Primary coil 17A twines, is fixed on the upper end periphery of the cylindrical body 19A that forms the thin cylinder shape.It is identical with the external diameter of stage portion 10A that cylindrical body 19A is formed its internal diameter.The bottom inner surface of cylindrical body 19A is bonded on the step difference face 10C of stage portion 10A of location division 8A, the inner peripheral surface of cylindrical body 19A upper end is bonded on the outer peripheral face of central plate 12.
Be fixed on being undertaken by following of primary coil 17A on the cylindrical body 19A to the fixing of yoke 2, for example, in advance, cylindrical body 19A is embedded on the central plate 12 outward, the inner surface of cylindrical body 19A upper end is bonded on the central plate 12, under the state that is fixed on the central plate 12, cylindrical body 19A is inserted in the yoke 2 from the top of yoke 2 with central plate 12, the bottom of cylindrical body 19A is bonded on the step difference face 10C, central plate 12 is fixed on the magnet 3 by bonding etc.
So, as internal magnetic type electromagnetic induction loud speaker 1A,, also can extremely easily carry out the location of primary coil 17A to yoke 2 even only primary coil 17A is configured on the side of secondary coil 15.
Moreover, be provided with above-mentioned location division 8A as stage portion 10A, still, can form the 8A of registration wire portion as recess, the bottom outer peripheral face of cylindrical body 19A bond to recess around.
In above-mentioned internal magnetic type electromagnetic induction loud speaker 1A, primary coil 17A is configured between secondary coil 15 and the central plate 12 in the magnetic gap 13, still, also can be primary coil configuration between the interior secondary coil 15 and annular plate 7 of magnetic gap 13.
Among the internal magnetic type electromagnetic induction loud speaker 1B shown in Figure 5, the 1st cylindrical body of fixing the outer circumferential side primary coil is directly bonded on the annular plate 7.
Moreover, compare with the internal magnetic type electromagnetic induction loud speaker 1 shown in Fig. 3, in the following internal magnetic type electromagnetic induction loud speaker 1B that illustrates, only the 1st cylindrical body is directly being bonded to this one side difference on the annular plate.In the explanation of internal magnetic type inductance induction loudspeaker 1B, only explain and the internal magnetic type electromagnetic induction loud speaker 1 different part of comparing, for other parts attached with part same in internal magnetic type electromagnetic induction loud speaker 1 on the identical symbol of appended symbol, omit its explanation.
Outer circumferential side primary coil 16 twined, is fixed in the upper end of the 1st cylindrical body 18A that forms the thin cylinder shape on week.It is identical with the external diameter of the 1st stage portion 9 that the 1st cylindrical body 18A is formed its internal diameter.On the 1st step difference face 9a of the 1st stage portion 9 of the inner surface bonding agent location division, bottom 8 of the 1st cylindrical body 18A, the outer peripheral face on the 1st cylindrical body 18A is bonded on the inner peripheral surface of annular plate 7.
In general, under situation about primary coil directly being bonded on the annular plate inner surface, because the outer peripheral face unevenness of primary coil, so must after making the plane, carry out bonding with bonding agent, very bothersome, when inserting cylindrical body in the yoke, there is primary coil to contact the danger that primary coil is produced damage with the inner surface of annular plate.
But, as above-mentioned internal magnetic type electromagnetic induction loud speaker 1B, bond on the annular plate 7, thus by the 1st cylindrical body 18A handle outer Monday of side primary coil 16, make bonding process become very easy, simultaneously outer circumferential side primary coil 16 can not contact with annular plate 7 and produces damage.
Among the internal magnetic type electromagnetic induction loud speaker 1C shown in Figure 6, form the location division as the groove of ring-type.
Moreover, compare with the internal magnetic type electromagnetic induction loud speaker 1 shown in Fig. 3, these are different on the one hand only to form the location division at the groove as ring-type in the following internal magnetic type electromagnetic induction loud speaker 1C that illustrates, in the explanation of internal magnetic type electromagnetic induction loud speaker 1C, only explain with internal magnetic type electromagnetic induction loud speaker 1 and compare and different parts, for other parts attached with part same in internal magnetic type electromagnetic induction loud speaker 1 on the identical symbol of appended symbol, omit its explanation.
Location division 8B is made of the 2nd groove 21 that is located at 2 the 1st circular grooves 20 on the concentric circles that forms on the bottom surface sections 5 and is positioned at its inboard.
Outer circumferential side primary coil 16 twines, is fixed on the upper end periphery of the 1st cylindrical body 18.The bottom of the 1st cylindrical body 18 is fixed in the 1st groove 20, simultaneously the outer peripheral face of outer circumferential side primary coil 16 is bonded on the inner peripheral surface of annular plate 7.
Be fixed on being undertaken by following of outer circumferential side primary coil 16 on the 1st cylindrical body 18 to the fixing of yoke 2, for example, the 1st cylindrical body 18 is fixed to the bottom of the 1st cylindrical body 18 in the 1st groove 20 in top insertion yoke 2, simultaneously, the outer peripheral face of outer circumferential side primary coil 16 is bonded on the inner peripheral surface of annular plate 7.
Interior all side primary coils 17 twine, are fixed on the upper end periphery of the 2nd cylindrical body 19.The bottom of the 2nd cylindrical body 19 is fixed in the 2nd groove 21, simultaneously the upper end inner peripheral surface of the 2nd cylindrical body 19 is bonded on the outer peripheral face of central plate 12.
Be fixed on being undertaken by following of interior all side primary coils 17 on the 2nd cylindrical body 19 to the fixing of yoke 2, for example, in advance being embedded on the central plate 12 outside the 2nd cylindrical body 19, the inner surface of the 2nd cylindrical body 19 upper ends being bonded on the central plate 12, under the state that is fixed on the central plate 12, the 2nd cylindrical body 19 is inserted in the yoke 2 from the top of yoke 2 with central plate 12, the bottom is fixed in the 2nd groove 21.
So, about above-mentioned location division 8B, as long as on the bottom surface sections 5 of yoke 2, form 2 grooves 20,21, so the formation of location division 8B is extremely easy.
In internal magnetic type electromagnetic induction loud speaker 1C, owing to fix the 1st cylindrical body 18 and the 2nd cylindrical body 19, can seek further to improve the installation strength of outer circumferential side primary coil 16 and interior all side primary coils 17 in the mode that is embedded into respectively in the 1st groove 20 and the 2nd groove 21.
Secondly, as the 2nd example, the external magnetic type electromagnetic induction loud speaker 22 shown in the key diagram 7.
External magnetic type electromagnetic induction loud speaker 22 possesses: yoke 23, magnet 24 and vibrating reed 25.
In yoke 23, the newel 27 that forms bottom surface sections 26 and stretch out upward from the central part of bottom surface sections 26.On the central part upper surface of bottom surface sections 26, formed location division 28.
Formed location division 28 as forming discoid stage portion 29.Formed the outer peripheral face 29a of stage portion 29 as the step difference face, upper surface 29b is positioned at the place, top slightly of the upper surface of bottom surface sections 26.Be provided with newel 27 integratedly with the central portion of the upper surface 29b of stage portion 29.
Magnet 24 cylindraceous is installed on the outer end of bottom surface sections 26 upper surfaces.By magnet 24 is configured in the not shown location indentations that for example forms on the upper surface of bottom surface sections 26, and with itself and stage portion 29 and newel 27 arranged coaxial.
Circular annular plate 30 is installed on the upper surface of magnet 24, disposes annular plate 30 accordingly with the upper end of newel 27 and make the upper end of newel 27 be positioned at the centre bore 30a of annular plate 30.The outer end upper surface of annular plate 30 is installed on the framework 31.The gap that forms between annular plate 30 and newel 27 becomes and is magnetic gap 32.Constitute magnetic circuit by yoke 23, magnet 24, annular plate 30 and newel 27.
Central shaft with the stage portion 29 of location division 28 is a benchmark, and the step difference face 29a that the inner peripheral surface of annular plate 30 is positioned at stage portion 29 is the outside slightly.
Vibrating reed 25 is made of following: be positioned on the central portion, be the circular-arc central portion 25a that forms with section shape; With the continuous setting of the periphery of central portion 25a and along with the rake 25b that upwards changes to overhanging layer; With the continuous edge part 25C of the periphery of this rake 25b; And the fixed part 33 that is provided with continuously with the periphery of central portion 25a and stretches out to the direction opposite with rake 25b.The outer end of edge part 25C is installed on the outer end upper surface of framework 31.By bonding etc., the upper end of cylindric bobbin 34 is fixed on the leading section of fixed part 33.
The secondary coil 35 of 1 circle is twined, is fixed on leaning on the end portion of bobbin 34, and this secondary coil 35 is located in the magnetic gap 32 that forms between annular plate 30 and the newel 27.
Outer circumferential side primary coil 26 and interior all side primary coils 37 are configured in the magnetic gap 32 with clamping secondary coil 35 and opposed mode.Outer circumferential side primary coil 36 is fixed on the inner peripheral surface of annular plate 30, and interior all side primary coils 37 are fixed on the outer peripheral face upper end of newel 27, and outer circumferential side primary coil 36 is connected in series with interior all side primary coils 37.One end of outer circumferential side primary coil 36 and interior all side primary coils 37 is connected with signal lead-out wire 36a, the 37a of supply from the audio signal of not shown acoustic signal reproducing unit respectively.
Outer circumferential side primary coil 36 twines, is fixed on the upper end periphery of the 1st cylindrical body 38 that forms the thin cylinder shape.It is identical with the external diameter of the stage portion 29 of location division 28 that the 1st cylindrical body 38 is formed its internal diameter.The bottom inner surface of the 1st cylindrical body 38 is bonded on the step difference face 29a of stage portion 29, the outer peripheral face that is fixed on the outer circumferential side primary coil 36 on the 1st cylindrical body 38 is bonded on the inner peripheral surface of annular plate 30.
Be fixed on being undertaken by following of outer circumferential side primary coil 36 on the 1st cylindrical body 38 to the fixing of yoke 23, for example, in advance the outer circumferential side primary coil 36 that is fixed on the 1st cylindrical body 38 is bonded on the inner peripheral surface of annular plate 30, under the state that is fixed on the annular plate 30, the 1st cylindrical body 38 is inserted in the centre bore 24a of magnet 24 from the top of magnet 24 with annular plate 30, the bottom of cylindrical body 38 is bonded on the step difference face 29a of stage portion 29 of location division 28.The 1st cylindrical body 38 outer being embedded on the stage portion 29, carry out the location of 36 pairs of yokes 2 of outer circumferential side primary coil thus, also carry out the location that 30 pairs of annular plates are installed in the magnet 24 on the yoke 2 thus simultaneously.Suitable methods such as annular plate 30 is bonding to the fixedly use of magnet 24, screw clamp are carried out.
Interior all side primary coils 37 twine, are fixed on the upper end periphery of the 2nd cylindrical body 39 that forms the thin cylinder shape.The external diameter that the 2nd cylindrical body 39 is formed its internal diameter and newel 27 is roughly the same.Outside the inner surface of the 2nd cylindrical body 39, be embedded under the state on the newel 27, carry out bonding.
Be fixed on being undertaken by following of interior all side primary coils 37 on the 2nd cylindrical body 39 to the fixing of newel 27, for example, the 2nd cylindrical body 39 be embedded on the newel 27 outward, carry out bonding.
So, as mentioned above, in external magnetic type electromagnetic induction loud speaker 22, on yoke 2, form location division 28, only by fixed the 1st cylindrical body 38 of outer circumferential side primary coil 36 and fixed the outer respectively stage portion 29 that is embedded into location division 28 of the 2nd cylindrical body 39 of interior all side primary coils 37 and with the integrally formed central plate 27 of yoke 2 on, just can carry out the location of outer circumferential side primary coil 36 and interior 37 pairs of yokes 2 of all side primary coils.
Thereby, can extremely easily carry out the location of outer circumferential side primary coil 36 and interior 37 pairs of yokes 2 of all side primary coils, owing to do not need to use the above-mentioned clearance gauge that has used so far,, contacting with outer circumferential side primary coil 36 or interior all side primary coils 37 of not worrying to cause because of clearance gauge come off so causing from yoke 2 etc.
Bond on the annular plate 30 and and bond on the newel 27 being fixed to outer circumferential side primary coil 36 on the 1st cylindrical body 38 because the step difference face 29a that the 1st cylindrical body 38 is bonded to location division 28 goes up simultaneously the 2nd cylindrical body 39, so it is big that bond area becomes, improved the adhesive strength of outer circumferential side primary coil 36 and interior all side primary coils 37.
About above-mentioned location division 28, as long as on the bottom surface sections 26 of yoke 2, form stage portion 29, so the formation of location division 28 is easy.
Formed above-mentioned location division 28 as the stage portion 29 of stretching out upward, still, the conduct on the contrary recess of opening up forms the location division, and the 1st cylindrical body 38 is bonded on the side face of recess.The groove that also can be used as ring-type forms the location division, and the bottom of the 1st cylindrical body 38 is inserted in this groove, fixed.
In external magnetic type electromagnetic induction loud speaker 22, the loud speaker that has disposed clamping secondary coil 35 and outer circumferential side primary coil opposite one another 36 and interior all side primary coils 37 is shown, but, also can be that primary coil only is configured in the external magnetic type electromagnetic induction loud speaker on one of the outer circumferential side of secondary coil or the interior all sides side.
In above-mentioned external magnetic type electromagnetic induction loud speaker 22, show outer circumferential side primary coil 36 is directly bonded to loud speaker on the annular plate 30, but, also can be fixed to the outer circumferential side primary coil on the inner peripheral surface of the 1st cylindrical body, the inner peripheral surface upper end of the 1st cylindrical body is directly bonded on the annular plate 30.
Moreover, in the concrete shape and the structure of the each several part shown in above-mentioned each example, all only be illustrated in an example of specializing when carrying out of the present invention enforcement, can not make determinate explanation to technical scope of the present invention in view of the above.
From above description as can be known, loud speaker of the present invention possesses: be fixed to the bobbin on the vibrating reed; Form magnetic circuit with magnet together and formed the yoke of location division; Be configured in the magnetic gap and the primary coil of input audio signal; And be arranged on the secondary coil that is configured in simultaneously on the above-mentioned bobbin in the above-mentioned magnetic gap; It is characterized in that, be provided with cylindrical body, above-mentioned primary coil is adhered on the one end, simultaneously, the other end is installed on the location division of yoke.
Thereby, can extremely easily carry out the location of primary coil to yoke owing to do not need to use clearance gauge, so needn't but coming off of causing because of clearance gauge contacts with primary coil of the heart from yoke etc.
In addition, primary coil directly or by cylindrical body is installed, so erection space becomes greatly, can seek the raising of installation strength.
The 2nd aspect of the present invention possesses: annular plate and the central module that is configured in the annular plate inboard with centre bore, it is characterized in that, between annular plate and central module, form above-mentioned magnetic gap, above-mentioned primary coil configuration between annular plate and the secondary coil or between central module and secondary coil.
Like this, even only primary coil configuration on a side of secondary coil, also can extremely easily carry out the location of primary coil to yoke.
In aspect the of the present invention the 3rd, be provided with: annular plate and the central module that is configured in the annular plate inboard with centre bore, between annular plate and central module, form above-mentioned magnetic gap, owing on the inner peripheral surface that above-mentioned primary coil is bonded in annular plate by cylindrical body or by cylindrical body it being bonded on the outer peripheral face of central module, so make bonding operation become very easy, primary coil can not contact with annular plate or central module and produces damage simultaneously.
The 4th aspect of the present invention possesses: the central module that is configured in the annular plate inboard with annular plate of centre bore, it is characterized in that, between annular plate and central module, form above-mentioned magnetic gap, above-mentioned primary coil is configured in respectively between annular plate and the secondary coil reaches between central module and the secondary coil.
Like this, even dispose primary coil, also can extremely easily carry out the location of primary coil to yoke in the mode of clamping secondary coil.
In aspect the of the present invention the 5th, owing to form the location division that is arranged on the above-mentioned yoke as stage portion, so the formation of location division is easy.
In aspect the of the present invention the 6th, owing to form the location division that is arranged on the above-mentioned yoke as the groove of ring-type, so the formation of location division is extremely easy.
In addition, owing to can fix cylindrical body in the groove by it is embedded into, so can seek further to improve the installation strength of primary coil.
In above-mentioned example, for example understand bobbin is bonded to structure on the vibrating reed, on one side the detailed structure of vibrating reed and bobbin linking portion is described with reference to following accompanying drawing below on one side.Moreover, in the loud speaker that uses the following drawings to describe, for example understand internal magnetic type electromagnetic induction loud speaker, in this internal magnetic type electromagnetic induction loud speaker, the situation that secondary coil itself has constituted coil pipe is illustrated simultaneously as an example, but, also can be applied in the internal magnetic type loud speaker that secondary coil is installed in the form on the bobbin shown in Fig. 3 to Fig. 6 certainly.
For shown in Fig. 8 and Fig. 9 speaker unit 319 that form describes bobbin and as the conductivity ring of secondary coil is directly fixing.
Speaker unit 319 possesses: yoke 320, magnet 321 and vibrating reed 322.
The circular annular plate 325 that stretches out the surrounding wall portion 324 of setting upward and be arranged on surrounding wall portion 324 upper limbs discoid bottom surface sections 323, from the periphery of this bottom surface sections 323 forms as one and constitutes yoke 320.Columned magnet 321 is installed on the central part of bottom surface sections 323 upper surfaces.The upper surface of the annular plate 325 of yoke 320 is installed on the framework 326.
Discoid central plate 327 is installed on the upper surface of magnet 321, central plate 327 is configured in the centre bore 325a of annular plate 325.The gap that forms between annular plate 325 and the central plate 327 is a magnetic gap 328.
By to metal material laminar material such as aluminium or titanium for example, perhaps, the laminar material that is made of macromolecular material carries out pressure processing etc., form in the whole mode that becomes the general dome shape, and be roughly hemispheric circular top part 329 on the central portion being positioned at, with the continuous linking part 330 of the periphery of circular top part 329, form roughly little circular-arc edge part 331 with the continuous section shape of the periphery of this linking part 330 and form as one with the continuous portion that is mounted 332 of the periphery of edge part 331 and constitute vibrating reed 322, being mounted on the upper surface that portion 332 is installed to framework 326.
Linking part 330 constitutes towards the planar portions 330b of above-below direction at the upwardly extending perimembranous 330a of upper and lower and with the lower edge of this perimembranous 330a continuously by being positioned at circular top part 329 1 sides.About vibrating 322, owing to stretch on both direction when pressure processing, the planar portions 330b in the linking part 330 that circular top part 329 and edge part 331 are linked up it form thinly especially.For example, utilize the bonding agent 334 of epoxy resin series, the upper end of conductivity ring 333 cylindraceous is fixed on the lower surface of planar portions 330b.
In order to reduce bobbin and, its thickness to be formed much thicker than the bobbin in the above-mentioned speaker unit 1 14 as the resistance of the conductivity ring 333 of secondary coil itself.The thickness of conductivity ring 333 is formed identical with the width of the planar portions 330b of vibrating reed 322.
Coating adhesive 334 on the whole lower surface of planar portions 330b bonds to the upper surface of conductivity ring 333 on the planar portions 330b by bonding agent 334.Make in the magnetic gap 328 that the roughly Lower Half of conductivity ring 333 forms between annular plate 325 and central plate 327.
Outer Monday lateral coil 335 and in Monday lateral coil 336 be configured in the magnetic gap 328 with clamping conductivity ring 333 and mode opposite one another.Outer Monday, lateral coil 335 was bonded on the inner peripheral surface of annular plate 325, and interior Monday, lateral coil 336 was bonded on the outer peripheral face of central plate 327.Outer Monday lateral coil 335 with interior Monday lateral coil 336 be connected in series, an end separately is connected from the not shown signal lead-out wire of not shown acoustic signal reproducing unit with audio signal with supply.
In case based on from the electric current of the audio signal of not shown acoustic signal reproducing unit by not shown signal lead-out wire supply to outer circumferential side coil 335 and in all lateral coils 336, induced current just flows in the conductivity ring 333 in being configured in magnetic gap 328, vibrating reed 322 vibrations, output is based on the audible sound of the audio signal of being supplied with by the acoustic signal reproducing unit.
So in above-mentioned speaker unit 319, owing to be coated with bonding agent 334 on the planar portions 330b that forms thinly especially, the actual (real) thickness of planar portions 330b increases the mechanical strength grow of planar portions 330b.
Thereby, because not occurring under the characteristic frequency with the planar portions 330b phase deviation that is node in circular top part 329 and edge part 331 is 180 ° vibration, so the whereabouts that does not produce acoustic pressure can obtain good frequency characteristic thus, so can seek to improve the quality of output acoustic signal.
As mentioned above, owing on the whole lower surface of planar portions 330b, be coated with bonding agent 334,, can seek further to improve the quality of output acoustic signal so the mechanical strength of planar portions 330b is very high.
As mentioned above, identical by the thickness of the conductivity ring 333 on forming the width that makes planar portions 330b and being bonded in this planar portions 330b, make the mechanical strength of planar portions 330b become high.
Be not limited to the structure shown in Fig. 9, the present invention also can be applied in the speaker unit such shown in Figure 10 for example or Figure 11.Among Figure 10 and Figure 11, only the structure to the linking portion of vibrating reed and bobbin illustrates, but, the structure of speaker unit other parts such as magnetic structure etc. are identical with the speaker unit shown in Fig. 9, for being marked with same designated symbol, omit its detailed explanation at this with the common part of Fig. 9.
In the speaker unit shown in Figure 10, the 1 circle time level coil 317 that is formed by electroconductive component is twined or is bonded on the bobbin 315 that is formed by insulating material.Bobbin 315 is formed cylindric, the one end is bonded on the lower surface 330b of planar portions 330, simultaneously its other end is inserted in the magnetic gap 328 in secondary coil 317 and primary coil 335,336 relative modes.Is bonding agent 316 that the leg-of-mutton mode of standing upside down is applied on the lower surface 330b of planar portions 330 of vibrating reed 322 with the section shape, bobbin 315 is adhered on the planar portions 330 of vibrating reed 322.
In the speaker unit shown in Figure 11, same with the speaker unit shown in above-mentioned Figure 10, secondary coil 317 is twined or is bonded on the bobbin 315A.Use aluminium or titanium etc. bobbin 315A form cylindric, simultaneously the one end is had with the right angle bend 318 of bending laterally.Bonding agent 316 is applied on the lower surface 330b of one of bend 318 surface or planar portions 330, the side of bobbin 315A, be that bend 318 is adhered on the planar portions 330 of vibrating membrane 322.
The present invention is not limited to above-mentioned each example, certainly various modification can be arranged in the scope that does not depart from main points of the present invention.

Claims (13)

1. speaker unit is characterized in that possessing:
Magnetic circuit portion has: magnet, be provided with above-mentioned magnet yoke, formed the top board of magnetic gap with above-mentioned yoke;
At least one primary coil is configured in the magnetic gap of above-mentioned magnetic circuit portion;
Vibrating reed;
Secondary coil in above-mentioned magnetic gap on to be arranged on above-mentioned vibrating reed with the opposed mode of above-mentioned primary coil;
Cylindrical body, a side that is positioned at above-mentioned magnetic gap is installed on the above-mentioned primary coil, to above-mentioned primary coil power supply; And
The location division is arranged on the above-mentioned yoke, and the opposite side of above-mentioned cylindrical body is positioned.
2. according to the speaker unit described in the claim 1, it is characterized in that an above-mentioned side of above-mentioned cylindrical body is configured between above-mentioned primary coil and the above-mentioned magnetic circuit portion.
3. according to the speaker unit described in the claim 1, it is characterized in that above-mentioned location division is the step difference that is arranged in the above-mentioned yoke portion.
4. according to the speaker unit described in the claim 1, it is characterized in that said apparatus also possesses: another primary coil, with it with in the above-mentioned magnetic gap that is configured in above-mentioned magnetic circuit portion across the above-mentioned secondary coil mode relative with above-mentioned primary coil; And another cylindrical body, above-mentioned another primary coil is seated on the interior side of above-mentioned magnetic gap, position by the opposite side of above-mentioned location division above-mentioned another cylindrical body, above-mentioned primary coil and above-mentioned another primary coil are connected in series.
5. according to the speaker unit described in the claim 4, it is characterized in that above-mentioned location division is made of following parts: the 1st step difference, the opposite side that forms above-mentioned cylindrical body on above-mentioned yoke positions; And the 2nd step difference, the opposite side of above-mentioned another cylindrical body is positioned.
6. according to the speaker unit described in the claim 5, it is characterized in that, in the bottom surface sections of above-mentioned yoke with step-like above-mentioned the 1st location division and above-mentioned the 2nd location division of having formed.
7. according to the speaker unit described in the claim 4, it is characterized in that above-mentioned location division is made of following parts: the 1st slot part, the opposite side that forms above-mentioned cylindrical body on above-mentioned yoke positions; And the 2nd slot part, the opposite side of above-mentioned another cylindrical body is positioned.
8. according to the speaker unit described in the claim 4, it is characterized in that, above-mentioned another primary coil is arranged on the position relative with the above-mentioned primary coil of above-mentioned yoke, simultaneously disposes above-mentioned another cylindrical body in the mode relative with above-mentioned secondary coil in the above-mentioned magnetic gap.
9. according to the speaker unit described in the claim 4, it is characterized in that, an above-mentioned side of above-mentioned another cylindrical body is configured between above-mentioned another primary coil and the above-mentioned magnetic circuit portion.
10. according to the speaker unit described in the claim 1, it is characterized in that above-mentioned vibrating reed possesses: the vibrating reed portion that forms the general dome shape; Be arranged on the edge part of side Monday outside the above-mentioned vibrating reed portion; And be arranged on par between above-mentioned vibrating reed portion and the above-mentioned edge part, above-mentioned secondary coil is configured on the above-mentioned par.
11. the speaker unit according to described in the claim 10 is characterized in that, an end of above-mentioned secondary coil is installed on the above-mentioned par.
12. the speaker unit according to described in the claim 10 is characterized in that, above-mentioned speaker unit also possesses bobbin, and above-mentioned secondary coil is being set, and an end of bobbin is installed on the above-mentioned par of above-mentioned vibrating reed.
13. the speaker unit according to described in the claim 12 is characterized in that, above-mentioned bobbin is at one end gone up and is formed bend, above-mentioned bend is bonded on the above-mentioned par of above-mentioned vibrating reed.
CNB998041556A 1998-11-19 1999-11-18 Speaker device Expired - Fee Related CN1189060C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP329649/1998 1998-11-19
JP32964998A JP4122602B2 (en) 1998-11-19 1998-11-19 Speaker device

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CN1189060C CN1189060C (en) 2005-02-09

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KR (1) KR100671972B1 (en)
CN (1) CN1189060C (en)
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KR100671972B1 (en) 2007-01-19
CN1189060C (en) 2005-02-09
US6359996B1 (en) 2002-03-19
KR20010034191A (en) 2001-04-25
WO2000032012A1 (en) 2000-06-02
JP4122602B2 (en) 2008-07-23
JP2000156896A (en) 2000-06-06

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